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©
2021 Lennox Industries Inc.
Corp. 1802-L1
Revised 02/2021
SL297UHNV
Service Literature
COMMUNICATING ENABLED SL297UHNV SERIES UNITS
SL297UHNV series units are 90% efficiency gas furnaces
used for upflow or horizontal applications only.
SL297UHNV units are available in heating capacities of
40,000 to 80,000 Btuh and cooling applications up to 4
tons. Refer to Product Specifications Manual for proper siz
ing.
Units are factory equipped for use with natural gas.
SL297UHNV model units are equipped with a communicat
ing enabled SureLight
®
two-stage variable speed integrated
control. All units use a redundant gas valve to assure safety
shut-off as required by C.S.A.
All specifications in this manual are subject to change. Pro
cedures outlined in this manual are presented as a recom
mendation only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommendations only and do not consti
tute code.
TABLE OF CONTENTS
Specifications
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components
. . . . . . . . . . . . . . . . . . . . . . .
II Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
III Start Up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating System Service Checks
. . . . . . . . .
V Typical Operating Characteristics
. . . . . . . . .
VI Maintenance
. . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation
. . . . . .
VIII Field Wiring and Jumper Settings
. . . . . . .
IX Program Unit Capacity Size Mode
. . . . . . .
X Troubleshooting
. . . . . . . . . . . . . . . . . . . . . . . .
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person
al injury or loss of life. Installation and service must
be performed by a licensed professional HVAC in
staller (or equivalent), service agency or the gas sup
plier.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in
jury. Take care while handling this equipment and
wear gloves and protective clothing.
